Yes

you do need a jacket based on the weather in Lincoln, NE, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
53°F12°C & Windy

Wind is 21 mph33 km/h from the SE, gusting to 39 mph62 km/h
April 26
2am53°F12°C20 mph31 km/h SERain
3am54°F12°C19 mph31 km/h SEThunderstorms
4am54°F12°C19 mph31 km/h SEThunderstorms
5am55°F13°C20 mph32 km/h SEThunderstorms
6am56°F13°C20 mph33 km/h SEThunderstorms
7am56°F13°C20 mph33 km/h SEThunderstorms
8am57°F14°C19 mph30 km/h SEWindy
9am57°F14°C19 mph30 km/h SEWindy
10am59°F15°C19 mph30 km/h SEWindy
11am60°F16°C20 mph33 km/h SEWindy
12pm63°F17°C21 mph33 km/h SEWindy
1pm66°F19°C21 mph34 km/h SEWindy
DateLowHighWindDayNight
April 2653°F12°C76°F24°C21 mph34 km/h from SThunderstormsMostly Clear
April 2752°F11°C75°F24°C6 mph9 km/h from EPartly CloudyRain
April 2853°F11°C68°F20°C12 mph19 km/h from SRainRain
April 2945°F7°C72°F22°C9 mph14 km/h from SWMostly ClearMostly Clear
April 3053°F12°C79°F26°C10 mph16 km/h from SWMostly ClearMostly Clear
May 156°F13°C74°F23°C14 mph22 km/h from SEDrizzleDrizzle
May 249°F10°C65°F19°C14 mph23 km/h from NWPartly CloudyClear

Yes

Low of 52°F11°C, High of 74°F24°C
Wind: 6 mph9 km/h
Precipitation: 42% rain

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